<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <title>登录验证</title>
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<center>
    <h3>登录验证</h3>
    <form action="/?c=sign&a=in" method="post" style="width: 40%;">
        <div class="input-group">
            <span class="input-group-addon">用户名</span>
            <input type="text" class="form-control" required="required" name="username">
        </div>
        <div class="input-group">
            <span class="input-group-addon">密&nbsp;&nbsp;&nbsp;&nbsp;码</span>
            <input type="password" class="form-control" required="required" name="password">
        </div>

        <button class="btn btn-default" type="submit">提交</button>
    </form>
</center>
<script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js"></script>
<script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</body>
</html>
